On 4.20 it was discovered that kubelet does not allow enough time for NSS dns lookups to time out and fallback to myhostname.

The code at issue is here: https://github.com/openshift/kubernetes/blame/release-4.20/pkg/volume/csi/csi_plugin.go#L384-L404
Even though it says it will wait up to 140s it isn't true as the function runs the first step without any delays, so there are just 5 delays adding up to about 23s. A demonstration of this is at https://go.dev/play/p/NEtWKYdF4x-

Additional context:
https://redhat-internal.slack.com/archives/C09SCTRBK7Z/p1764239834038539?thread_ts=1764167382.927139&cid=C09SCTRBK7Z

    4.20.z

    Always

    1. Create a new worker node whose DNS server will time out
    2. Observe that kubelet will never create the Node object
    3.
    

    No Node object is created, instead kubelet continually errors out and is restarted

    Kubelet creates the Node object and the worker joins the cluster successfully

This is a result of the investigation into OCPBUGS-64883. Currently ARO has declared this an upgrade risk for 4.20.